Sight for firearms



May 27, 1930. T. A. wATsoN SIGHT FOR FIREARMS Filed July 23. 1927 an. aannam-cat w Patented May 27, 1930 THOMAS ARCHER WATSON, OF TORONTO, ONTARIO, CANADA SIGHT FOR FIREARivis Application filed July 23,

The principal objects of the invention, are, to ensure an accurate dependable adjustmentfor rifle and gun sights, and to provide a very simple form of adjustable sight which will automatically compensate for wear.

A further and important object is to provide a structure of sight which presents a very clear and easily readable scale.

The principle feature of the invention consists in the novel construction and arrangement of parts, whereby a stem carrying the sight member is formed with bevelled siirfaces engaging the bevelled surfaces of a groove in a fixed member, and a rotatable nut is normally spring held in contact with the threaded surface of said sight carrying member to operate the same and hold it in close sliding engagement with the grooved member, said nut being capable of being disengaged from the sight member to permit a rapid adjustment of the sight.

In the drawings, Figure 1 is a perspective view of my improved form of gun sight.

Figure 2 is an enlarged part vertical sectional view through the gun sight.

Figure 2ZL is an enlarged mid-sectional ele: vational view of a portion of the device shown in Figure 2.

Figure 3 's an enlarged cross sectional view on the line 3-3 of Figure 2.

Figure 4 is an elevational view of a slightly different form of my improved sight.

Figure 5 is an enlarged cross sectional view on the line 5-*5 of Figure 4.

`The construction of my improved sight is very simple. It consists of a bar 1 which is pivoted to the base plate 2 and has an orifice 3 in the top thereof. i

Rigidly secured in the orifice 3 is a cylindrical bar 4 which bar is formed with a longitudinal channel 5 having flat converging side walls 6.

A longitudinal shallow groove 7 is formed in the back of the bar 4 in substantially central alignment with the channel 5 and a circumferential groove 8 is formed in the inember 4 adjacent to the top of said bar.

A cylindrical nut 9 having its bore mate rially greater than the outer diameter of the 1927. Serial No. 207,922.

cylindrical bar 4 so that it loosely encircles the end of the bar 4 and the wall of said bore is threaded fiom end to end and is provided with a circumferential groove 10 about midway of its length.

A narrow flat bowed spring 11 is inserted between the bar 4 and the nut 9, the ends of the bowed spring resting in and sliding in the groove 7.

The spring is held from displacement from between the bar 4 and nut 9 by being formed in the centre with a hump 12 which extends into the circumferential groove 10 in the bore of the nut.

The nut 9 is retained in place against axial movement by a thin split spring collar 13 which fits into the circumferential groove S at the top of the bar 4 with its free ends extending around tlie wall of the bar 4 and terminating adjacent the side walls 6 of the channel 5 formed therein. The nut is thus firmly held against axial movement but may be readily rotated or displaced radially against the pressure of the spring 11 for purposes to be hereinafter referred to.

A sighting member 14 is formed of a bar having a pair of bevelled sides 15 which are bevelled on an angle corresponding to the angle of the walls 6 of the channel 5 in the bar 4, but the apex or narrow edge of the member 14 does not bottoni in the said chan nel so that a clearance is provided.

The rounded outer surface 16 of the member 14 protrudes beyond the cylindrical wall of the member 4 and is thread cut throughout its length to ft the thread of the nut 9.

The arrangement of the spring 11 within the nut in alignment with the apex portion of the member 14 normally holds the threaded wall of the nut in close engagement with the threaded portion of the sighting member and the flexibility of this contact ensures compensation for any wear that takes place in the threaded surfaces, and the nut is positively retained against axial displacement by the spring collar 131 A very sensitive adjustment is thus provided in that the sighting member which is normally in the threaded engagement with the nut will at all times respond to the slightest rotatlve movement of the nut in either direction and backlash is entirely overcome.

Further, the action of the spring 11 which presses the nut radially into contact with the forward threaded surface 16 of the sighting member effects the holding of the sighting member with its longitudinal surfaces in close litting engagement with the bevelled side walls of the channel 5 and compensates for wear without permitting any looseness to occur.

It will be readily seen that the sight is very easy of adjustment, the nut 9 which is knurled on its outer surface is merely rotated by the finger and thumb and moves the sighting member up or down. When a rapid adjustment of the sighting member is desired, the nut member may be pressed radially inward a suliicient distance to move the threaded wall of the bore of the nut completely out of its normal engagement with the threads of the sight bar whereupon the latter will be free to be moved longitudinally in the block. This feature of providing a rapid disengagement of the nut with the sight bar is particularly advantageous when it is desired to completely remove the sight bar when the gun is not in use. The sighting member is provided with gauge marks 17 on one or both of its bevelled surfaces to indicate the range by its registration with the top end of the nut. Whatever wear occurs in the bevelled surfaces is taken up in the manner described and whatever wear occurs between the threaded surfaces is compensated for by the flexibility in the spring 11.

In the form of sight illustrated in Figures 4 and 5, the same principles are involved. The sight block 18 which is secured in any suitable manner to the gun has a V-shaped channel orifice 19 in which the sight bar 2() slides.

A nut 2l is arranged in a slot 22 in the block and is held in contact with the threaded surface 23 of the sight bar by a bow spring 24, which engages a peripheral groove 25 which in this case is in the outer periphery of the nut.

The bar 20 is provided with a suitable scale 26 on its vertical portion and has a horizontal portion 27 on which the sighting cup 28 is slidably mounted.

The cup 28 is operated for adjustment for windage by means of a micrometer adjusting member 29. The details of this mechanism is not shown nor claimed in this application.

A sight such as described is extremely simple to manufacture. The structure is rugged and will not get out of order. It is self-adjusting to compensate for wear and renders the device extremely serviceable.

What I claim as my invention is 1. A sight for fire-arms, comprising a guide member having a longitudinal groove formed with bevelled sides, a sighting member slidable along said groove and bevelled to engage the sides thereof, resilient means for holding said sighting member in contact with the bevelled sides of said groove including means held in position by said resilient means for raising and lowering said sighting member.

2. A sight for fire-arms, comprising a sight member having a stem formed with a pair of longitudinal faces converging to one side and formed with a threaded surface at the divergent side, a guide member having a groove the sides of which are bevelled outwardly at a corresponding angle to the bevelled faces of the sight member and forming an open recess of greater depth than the sight member, a threaded nut engaging the threaded surface of the sight member and loosely surrounding the guide member, and a spring between the nut and guide member holding the nut in close engaging contact with the threaded sight member.

3. A sight for fire-arms, comprising a guide having a substantially V-shaped recess open at one side, a sight member having a pair of convergent longitudinal surfaces adapted to engage the convergent surfaces of the guide and having its outward surface threaded, a nut threaded internally engaging the threaded surface of said sight member and extending loosely around said guide, said nut having an annular groove in its inner wall arranged centrally of its length, and a bowed spring having its ends slidably engaging the back of said guide and having its central portion engaging the groove in said nut.

l. A sight for lire-arms, comprising a bar having a guide portion formed with a longitudinal slot in one side thereof, said slot havingconvergent longitudinal sides, a longitudinal groove in the back of said guide arranged in central alignment with the aforesaid slot, a sight carrying member having a pair of longitudinal faces converging to one side thereof, said faces being adapted to fit in sliding contact with the faces of the open slot in said guide and said sight member having a threaded surface on its widest side between the bevelled surfaces, a cylindrical nut encircling said guide and sight member threaded to engage the threaded surface of said sight member and having a groove in its inner periphery midway of its length, a bowed spring having a central portion to engage the groove in said nut and having its ends engaging the groove in the back of said guide, and a collar holding the nut in spaced relation to the guide.

5. A sight for fire-arms, comprising a sight member having a substantially V-shaped stem formed with graduation marks thereon and threaded on one side thereof between the bevelled V-faces, a guide having a V-shaped isomers-lo.

groove adapted to receive and support said sight member in a sliding engagement, a nut encircling said guide and sight member and engaging the threaded portion of said sight 5 member, and means for spring holding the nut in threaded engagement with said sight member'.

6. A sight for lirearms, comprising a guide member having a longitudinal groove formed with bevelled sides, a sighting member slidable in said groove and bevelled to engage the sides thereof, means for raising and lowering said sighting member in the groove, and resilient means eo-operatively arranged between said latter means and said guide member for holding the raising and lowering means in engagement with said sighting member and the latter' in engagement with the bevelled sides of said groove.

7. A sight for firearms, comprising a guide member having a longitudinal groove formed with bevelled sides, a sighting member slidable in said groove and bevelled to engage the sides thereof, means detachably engaging said sighting member for raising and lowering the same in the groove, and resilient means for yieldingly holding said detachable means in normal operative engagement with said sighting member.

THMAs ARoHER WATSON. 

